Excludability is the property of a good whereby
a. a person can be prevented from using it.
b. the resource is congestible.
c. the government rations the quantity of a good that is available.
d. one person's use diminishes other peoples' use.

A. a person can be prevented from using it.

Explanation:

Excludability -

In economics , a good or service is refereed to as  excludable , when it is not allowed to be consumed or used by the consumers who have not paid for the good or services .

And , similarly , non - excludable are the one when a non - paying consumer ca not be prevented from using it .

Hence , the correct statement for Excludability is ( a ) .

answer: d. characteristics of guests

explanation: it is directly related to the spending characteristics of attendees who fall into each of these categories:

answer; no individual buyer or seller has any significant impact on the market price;